1. Department of Oral and Maxillofacial Radiology, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
2. Philips Electronics Japan, Ltd. 2-13-37 Konan, Minato-ku, Tokyo 108-85 07, Japan
3. Imaging Systems, Philips Healthcare, Best, The Netherlands
4. Radiology Center, Kyushu University Hospital, Kyushu University, Fukuoka 812-85 82, Japan
5. Section of Oral and Maxillofacial Oncology, Division of Maxillofacial Diagnostic and Surgical Sciences, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
6. Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
7. Section of Image Diagnosis, Department of Diagnostics and General Care, Fukuoka Dental College, Fukuoka 814-0193, Japan